|Community|Area|Location|Population|Date established|
|---|---|---|---|---|
|Beaver Lake 17|49.4 hectares (122 acres)|78.4 km. southeast of Halifax|23|March 3, 1867|
|Cole Harbour 30|18.6 hectares (46 acres)|9.6 km. east of Halifax|194|March 3, 1880|
|Millbrook 27|302.0 hectares (746 acres)|8 km. south of Truro|847|March 3, 1886|
|Sheet Harbour 36|32.7 hectares (81 acres)|91.2 km. northeast of Halifax|15|March 3, 1915|
|Truro 27A|16.7 hectares (41 acres)|Joined south of Truro town limit|0|March 3, 1904|
|Truro 27B|16.4 hectares (41 acres)|Joined with 27A on south|0|March 3, 1907|
|Truro 27C|9.5 hectares (23 acres)|Joined with 27B on south|0|March 3, 1909|

Question: how many communities have a population of zero?
Answer: 3